Sep 13, 2011 · The horsepower of any 305 depends on what all is done to the engine. Changing from flat tappet to roller will gain some. There are other ways to increase horsepower and there are other ways to ... May 25, 2010 · HOW TO BUILD A HIGH-PERFORMANCE CUMMINS DIESEL ENGINE This is a very controversial subject and 99% of the mechanics who build diesel engines will disagree with what we have to say and will probably refuse to build the engine for you. For the owner-operator who loves horsepower do not give up when you speak to the negative mechanic.

They can have 350+ HP but less than 800 ft lbs of torque. There are Cummns ISC 8.3L engines with only 330 HP but 900+ ft lbs. 100lbs of weight/one HP is a good rule, except if it's a ISB. The Cummins ISL 400/425 HP is a good engine with plenty of torque/1200+. Chances are, if an engine is losing power, the timing isn't advanced enough. Check for a worn points lobe on the camshaft, too. ü Compression is when the air/fuel mixture is adequately pressurized on the compression stroke. The secret to gaining more horsepower and torque is increase the compression ratio and combustion chamber pressure. Nov 19, 2018 · If you pump diesel into your truck, upgrading to a new performance packing intercooler is another way to give your Ford F-350 increase torque. When your engine is a little too hot to handle, an improved intercooler cools things down, blasting cool dense air to amplify hp and torque.